where \(O_{ij}\)  is the original output feature map.
Since the binary function is not differentiable for \(\alpha _{ij}\) , we employ STE [1]} to estimate the gradient of \(\alpha _{ij}\)  as:
\(\frac{\partial \mathcal {L}_{arch}}{\partial \alpha _{ij}}=\frac{\partial \mathcal {L}_{arch}}{\partial I_{ij}},\) 
